Implement for cutting stone



(No Model.)

5 J. W. MALOY.

IMPLEMENT FOR CUTTING STONE, w.

Patented Mar. 19, 1889.

llwrrnn trarne Farrar @tripa JAMES W. MALOY, OF MARIETTA, GEORGIA.

IMPLEMENT FOR CUTTING STONE, 8u).

SPECIFICATION forming part of Letters Patent No. 399,680, dated March 19, 1889.

Application filed July 12, 1888. Serial No. 279,760. (No model.)

To all whom t 1v1/tty concern.-

Be it known that I, JAMES IV. MALOY, a citizen of the United States, residing in Illarietta, in the county of Cobb and State of Georgia, have invented certain new and useful Improvements in Implements for Cutting Stone, dre., of which the following is a specification.

My invention relates to that class of reducing implements in which a hollow frame, to and'from which air is alternately admitted and withdrawn, is provided with a sliding piston or hammer operating upon a stock carried by the frame; and my invention consists in providing such frame with converging arms supporting converging stocks, as fully set forth hereinafter, so that the reaction of one will neutralize that of the other and per mit the implement to be more effectively maintained in this position in operating upon a surface to reduce it.

In the accompanying drawings, Figure l is a sectional elevation of a stone-reducing implement embodying my invention. Fig. 2 is a side view illustrating a modification, and Fig. 3 is a side view illustrating another modilication.

The frame A of theimplement is hollow and coincides with a broken circle, the ends converging, and through which ends extend the stocks 2 of a tool, 3, of any suitable character, which is detachably supported by the stock, and the said stock within the hollow frame is provided with a head, 4, and is encircled by a spring, 5, which bears upon the head and upon the flange 6 at the end of the frame and tends to draw inward the stock. A pin, 7, passing through the stock and contacting with the end of the frame limits the extent of the inward motion. Vithin the frame are two hammers, S 8, which are curved to correspond to the contour of the frame, and are litted thereto so as to slide freely, and so as to constitute pistons which may be actuated by pneumatic action. The frame is provided with one or more handles, 9 l0 ll, suitably disposed, so as to permit the saine to be readily gripped, and has a central port, x, communieating with a flexible pipe, l2, leading to a pump, 18, constructed in any suitable manner, so as to alternately force the air into and exhaust it from the chamber of the frame.

The parts being constructed as above described, and the pump being set in rapid motion, a rapid reciprocation is imparted to the hammers 8 S, which are brought violently against the heads 4 of the tools, and are then carried therefrom, thereby driving the tools forcibly against any surface to which they may be applied, while the springs carry them away from said surface as soon as the hammers are lifted.

Inasmuch as the tools converge so as to strike the surface to be reduced at opposite angles, less effort is required to maintain the tool in its proper position upon the said surface than would be necessary where a single tool was employed, as the action of one tool tending to force it away from the surface is counteracted by that of the other.

The frame A may be a rigid frame, as shown in Fig. l, or it may be jointed in the center, as shown in Fig. 2, so as to permit the two hammers to be brought to a greater or less angle to each other, and also permit the tools to be brought closer together or be can ried farther apart. In this case the two chambers containing the two Vpistons may be separated from each other, the inlet-pipe having a branch, as shown.

YVhile I prefer to use a curved frame, as set forth, the same converging of the tools may be secured by means of a frame having two straight converging arms with pistons or hammers therein, as shown in Fig. 3.

Vithout limiting myself to the precise form of construction and arrangement shown, I

IOO

the ends of the arms, a sliding hammer within each arm, and a pump connected with the chambers in the arms through a flexible pipe, substantially as set forth.

3. A stone-cutting implement consisting of a frame provided with hollow arms hinged together, each containing a reciprocating hammer and provided with a tool-stock extending through the end of the arm in position to be Io struck by the hammer, and a spring for retracting the stock, and a port for the admission and discharge of air into and from the hollow arms, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two sub- 15 scribing witnesses.

v JAMES W. MALOY.

Vtitnesses: f

GEO. F. NEWELL, A. Y. LEAKE. 

